D. I. Machado

TL;DR: Observations of a multichord stellar occultation revealed the presence of a ring system around (10199) Chariklo, which is a Centaur—that is, one of a class of small objects orbiting primarily between Jupiter and Neptune—with an equivalent radius of 124 9 kilometres.

TL;DR: In this article, the authors presented 104 central instant determined from the observations of 66 mutual approximations between the Galilean moons carried out at different sites in Brazil and France during the period 2016-2018.

TL;DR: In this article, the authors presented results from three world-wide campaigns that resulted in the detections of two singlechord and one multi-chord stellar occultations by the Plutino object (84922) 2003~VS$_2 ).

TL;DR: In this article, the authors observed a stellar occultation by the Galilean moon Europa (J2) and proposed a campaign for observing stellar occultations for all Galilean moons, where the authors measured the light flux of the occulted star and object to determine the time when the flux dropped with respect to one or more reference stars, and the time that it rose again for each observational station.

TL;DR: In this article, the authors used stellar occultations to constrain the physical parameters of the Centaur and its rings, and determined the structure of the rings and obtained precise astrometrical positions of Chariklo.